Qui se ressemble, s'assemble. In full feather. Flush of
money. In allusion to birds not on the moult. In grand feather.
Dressed to the nines.

In high feather.

In exuberant spirits, joyous. When birds are moulting they mope
about, but as soon as they regain their feathers their spirits revive.

Tickled with a feather.

Easily moved to laughter. “Pleased with a feather, tickled with a
straw,” is more usual; Rire de la moindre bagatelle.

Also annoyed by trifles, worried by little annoyances.

From day to day some silly things
Upset you altogether;
There's nought so soon convulsion brings
As tickling with a feather.
`Gainst minor evils let him pray
Who Fortune's favour curries,
For one that big misfortunes slay,
Ten die of little worries.

Sims: Ballads of Babylon
(Little Worries).

Cut a feather.

A ship going fast is said to cut a feather, in allusion to the
ripple which she throws off from her bows. Metaphorically, “to cut a
dash.”